I think Chromecast apps are exclusively HTML5 based, so this means HBOGo now has at least the player part of the app ported over to HTML5, which means there is hope that we will see HBOGo on TiVo in the future.

The Chromecast is a much simpler platform. It basically just needs a URL and a basic player. The "app" part is already written for the iOS or Android device. TiVo requires a complete app. I assume all the apps that are on TiVo are being ported to the HTML5 platform and once they are they will support DIAL.